Office chair



FIG. 1 is a perspective view of an office chair showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings depict stitching which forms part of the claimed design. 

CLAIM The ornamental design for an office chair, as shown and described. 